I'm a fan of OneCare, and here's why: it's simple, and includes a 3-computer license. The "all in one" functionality is especially useful for machines I rarely log into ... so, tonight, while checking one of the machines, I couldn't help but notice my spyware definitions were a tad out of date:

It's especially ironic that the default icon for Windows Defender is a castle! OK, it's amusing, but makes sense for computer geeks. In fact, when calling File.GetLastWriteTime() in .NET, this date is returned when the file is not found (see remarks). Strange, though, that Windows Defender is in fact installed and working on the machine. You'd think it would at least default to some reasonable date.